There's nothing magical about the number, yet five digits at the end of their limbs is a motif that runs through all the animals with four limbs, called tetrapods. Even when there are fewer than ...
The researchers focused on tetrapods — vertebrates with four legs. They investigated more than 33,000 species worldwide and identified 25 priority tetrapod EDGE Zones across 33 countries.
In this video segment from NOVA: "Judgment Day: Intelligent Design on Trial," paleontologist Neil Shubin recounts a fossil discovery that added another compelling piece to the body of evidence ...
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